Lightweight concrete based on foam glass gravel: composition, structure and properties

Abstract

Abstract The article discusses the research results, the purpose of which is to provide the possibility of increasing the physical and mechanical as well as heat-shielding properties of lightweight cement concrete based on foam-glass gravel. The authors also investigated the possibility of reducing the alkali-silica reaction occurring in such concretes. To evaluate the course of the alkali-silica reaction, a method is used based on the study of the microstructure of lightweight concrete samples. The article also assesses the physical and mechanical as well as thermal engineering properties of lightweight concrete based on foam-glass gravel. The determination of properties is carried out according to standard methods. Analysis of the microstructure lightweight concrete samples allowed to fix flowing alkali-silica reaction. To reduce the alkali-silicate interaction, the authors propose introducing into the concrete composition a complex additive consisting of a siliceous modifier and a plasticizing component. The developed compositions of lightweight concrete, belonging to the class of structural and thermal insulation, have a compressive strength of 6.84-9.05 MPa, a density mark grade of D500-D1500 and a thermal conductivity of 0.218-0.282 W/(m°C).